The clash happened about 8:30 Friday night in the driveway of a home in the 7500 block of El Cerro Drive, he said.

After the 41-year-old victim, who was not named, went to a local Kaiser hospital, suspicious medical staff called police about 2:30 a.m. Saturday.

The man actually tried to save the chewed up piece of flesh, Luong said, but it was so torn up that doctors were unable to reattach it. The corporal described it as a chunk containing the victim's right eyebrow "about the size of an egg."

"He's got to get reconstructive surgery," Luong said of the victim.

Aguilar was arrested on suspicion of felony mayhem, and was being detained on an immigration hold because he's allegedly undocumented, Luong said.

It wasn't clear what the fight was about. The corporal:

The suspect punched the victim, got on top of him, straddled him, and leaned in to bite off a big chunk of his right eyebrow area.

Luong said the suspect claimed he didn't even remember biting off the eyebrow. Aguilar, brought in by detectives for an interview Monday, said his actions were in self-defense; he even showed off a few scratches, Luong said:

Based on his interview and lack of physical evidecne that would lend to his self-defense claims, he was arrested for felony mayhem by detectives.

Aguilar, police said, had been drinking, and so had the victim who, it appears, will recover and forever retain the nickname El Unobrow.